gns3-server/gns3server/compute/virtualbox/virtualbox_vm.py

# -*- coding: utf-8 -*-
#
# Copyright (C) 2014 GNS3 Technologies Inc.
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

"""
VirtualBox VM instance.
"""

import sys
import shlex
import re
import os
import tempfile
import json
import socket
import asyncio
import xml.etree.ElementTree as ET

from gns3server.utils import parse_version
from gns3server.utils.asyncio.telnet_server import AsyncioTelnetServer
from gns3server.utils.asyncio.serial import asyncio_open_serial
from gns3server.utils.asyncio import locked_coroutine
from gns3server.compute.virtualbox.virtualbox_error import VirtualBoxError
from gns3server.compute.nios.nio_udp import NIOUDP
from gns3server.compute.adapters.ethernet_adapter import EthernetAdapter
from gns3server.compute.base_node import BaseNode

if sys.platform.startswith('win'):
    import msvcrt
    import win32file

import logging
log = logging.getLogger(__name__)


class VirtualBoxVM(BaseNode):

    """
    VirtualBox VM implementation.
    """

    def __init__(self, name, node_id, project, manager, vmname, linked_clone=False, console=None, adapters=0):

        super().__init__(name, node_id, project, manager, console=console, linked_clone=linked_clone, console_type="telnet")

        self._maximum_adapters = 8
        self._system_properties = {}
        self._telnet_server = None
        self._local_udp_tunnels = {}

        # VirtualBox settings
        self._adapters = adapters
        self._ethernet_adapters = {}
        self._headless = False
        self._acpi_shutdown = False
        self._vmname = vmname
        self._use_any_adapter = False
        self._ram = 0
        self._adapter_type = "Intel PRO/1000 MT Desktop (82540EM)"

    def __json__(self):

        json = {"name": self.name,
                "node_id": self.id,
                "console": self.console,
                "console_type": self.console_type,
                "project_id": self.project.id,
                "vmname": self.vmname,
                "headless": self.headless,
                "acpi_shutdown": self.acpi_shutdown,
                "adapters": self._adapters,
                "adapter_type": self.adapter_type,
                "ram": self.ram,
                "status": self.status,
                "use_any_adapter": self.use_any_adapter,
                "linked_clone": self.linked_clone}
        if self.linked_clone:
            json["node_directory"] = self.working_dir
        else:
            json["node_directory"] = None
        return json

    @asyncio.coroutine
    def _get_system_properties(self):

        properties = yield from self.manager.execute("list", ["systemproperties"])
        for prop in properties:
            try:
                name, value = prop.split(':', 1)
            except ValueError:
                continue
            self._system_properties[name.strip()] = value.strip()

    @asyncio.coroutine
    def _get_vm_state(self):
        """
        Returns the VM state (e.g. running, paused etc.)

        :returns: state (string)
        """

        results = yield from self.manager.execute("showvminfo", [self._vmname, "--machinereadable"])
        for info in results:
            if '=' in info:
                name, value = info.split('=', 1)
                if name == "VMState":
                    return value.strip('"')
        raise VirtualBoxError("Could not get VM state for {}".format(self._vmname))

    @asyncio.coroutine
    def _control_vm(self, params):
        """
        Change setting in this VM when running.

        :param params: params to use with sub-command controlvm

        :returns: result of the command.
        """

        args = shlex.split(params)
        result = yield from self.manager.execute("controlvm", [self._vmname] + args)
        return result

    @asyncio.coroutine
    def _modify_vm(self, params):
        """
        Change setting in this VM when not running.

        :param params: params to use with sub-command modifyvm
        """

        args = shlex.split(params)
        yield from self.manager.execute("modifyvm", [self._vmname] + args)

    @asyncio.coroutine
    def _check_duplicate_linked_clone(self):
        """
        Without linked clone two VM using the same image can't run
        at the same time.

        To avoid issue like false detection when a project close
        and another open we try multiple times.
        """
        trial = 0

        while True:
            found = False
            for node in self.manager.nodes:
                if node != self and node.vmname == self.vmname:
                    found = True
                    if node.project != self.project:
                        if trial >= 30:
                            raise VirtualBoxError("Sorry a node without the linked clone setting enabled can only be used once on your server.\n{} is already used by {} in project {}".format(self.vmname, node.name, self.project.name))
                    else:
                        if trial >= 5:
                            raise VirtualBoxError("Sorry a node without the linked clone setting enabled can only be used once on your server.\n{} is already used by {} in this project".format(self.vmname, node.name))
            if not found:
                return
            trial += 1
            yield from asyncio.sleep(1)

    @asyncio.coroutine
    def create(self):
        if not self.linked_clone:
            yield from self._check_duplicate_linked_clone()

        yield from self._get_system_properties()
        if "API version" not in self._system_properties:
            raise VirtualBoxError("Can't access to VirtualBox API version:\n{}".format(self._system_properties))
        if parse_version(self._system_properties["API version"]) < parse_version("4_3"):
            raise VirtualBoxError("The VirtualBox API version is lower than 4.3")
        log.info("VirtualBox VM '{name}' [{id}] created".format(name=self.name, id=self.id))

        if self.linked_clone:
            if self.id and os.path.isdir(os.path.join(self.working_dir, self._vmname)):
                self._patch_vm_uuid()
                yield from self.manager.execute("registervm", [self._linked_vbox_file()])
                yield from self._reattach_linked_hdds()
            else:
                yield from self._create_linked_clone()

        if self._adapters:
            yield from self.set_adapters(self._adapters)

        vm_info = yield from self._get_vm_info()
        if "memory" in vm_info:
            self._ram = int(vm_info["memory"])

    def _linked_vbox_file(self):
        return os.path.join(self.working_dir, self._vmname, self._vmname + ".vbox")

    def _patch_vm_uuid(self):
        """
        Fix the VM uuid in the case of linked clone
        """
        if os.path.exists(self._linked_vbox_file()):
            tree = ET.parse(self._linked_vbox_file())
            machine = tree.getroot().find("{http://www.virtualbox.org/}Machine")
            if machine is not None:
                machine.set("uuid", "{" + self.id + "}")
                tree.write(self._linked_vbox_file())

    @asyncio.coroutine
    def check_hw_virtualization(self):
        """
        Returns either hardware virtualization is activated or not.

        :returns: boolean
        """

        vm_info = yield from self._get_vm_info()
        if "hwvirtex" in vm_info and vm_info["hwvirtex"] == "on":
            return True
        return False

    @asyncio.coroutine
    def start(self):
        """
        Starts this VirtualBox VM.
        """

        if self.status == "started":
            return

        # resume the VM if it is paused
        vm_state = yield from self._get_vm_state()
        if vm_state == "paused":
            yield from self.resume()
            return

        # VM must be powered off to start it
        if vm_state != "poweroff":
            raise VirtualBoxError("VirtualBox VM not powered off")

        yield from self._set_network_options()
        yield from self._set_serial_console()

        # check if there is enough RAM to run
        self.check_available_ram(self.ram)

        args = [self._vmname]
        if self._headless:
            args.extend(["--type", "headless"])
        result = yield from self.manager.execute("startvm", args)
        self.status = "started"
        log.info("VirtualBox VM '{name}' [{id}] started".format(name=self.name, id=self.id))
        log.debug("Start result: {}".format(result))

        # add a guest property to let the VM know about the GNS3 name
        yield from self.manager.execute("guestproperty", ["set", self._vmname, "NameInGNS3", self.name])
        # add a guest property to let the VM know about the GNS3 project directory
        yield from self.manager.execute("guestproperty", ["set", self._vmname, "ProjectDirInGNS3", self.working_dir])

        if self.use_ubridge:
            yield from self._start_ubridge()
            for adapter_number in range(0, self._adapters):
                nio = self._ethernet_adapters[adapter_number].get_nio(0)
                if nio:
                    yield from self._add_ubridge_udp_connection("VBOX-{}-{}".format(self._id, adapter_number),
                                                                self._local_udp_tunnels[adapter_number][1],
                                                                nio)

        yield from self._start_console()

        if (yield from self.check_hw_virtualization()):
            self._hw_virtualization = True

    @locked_coroutine
    def stop(self):
        """
        Stops this VirtualBox VM.
        """

        self._hw_virtualization = False
        yield from self._stop_ubridge()
        yield from self._stop_remote_console()
        vm_state = yield from self._get_vm_state()
        if vm_state == "running" or vm_state == "paused" or vm_state == "stuck":
            if self.acpi_shutdown:
                # use ACPI to shutdown the VM
                result = yield from self._control_vm("acpipowerbutton")
                self.status = "stopped"
                log.debug("ACPI shutdown result: {}".format(result))
            else:
                # power off the VM
                result = yield from self._control_vm("poweroff")
                self.status = "stopped"
                log.debug("Stop result: {}".format(result))

            log.info("VirtualBox VM '{name}' [{id}] stopped".format(name=self.name, id=self.id))
            yield from asyncio.sleep(0.5)  # give some time for VirtualBox to unlock the VM
            try:
                # deactivate the first serial port
                yield from self._modify_vm("--uart1 off")
            except VirtualBoxError as e:
                log.warn("Could not deactivate the first serial port: {}".format(e))

            for adapter_number in range(0, self._adapters):
                nio = self._ethernet_adapters[adapter_number].get_nio(0)
                if nio:
                    yield from self._modify_vm("--nictrace{} off".format(adapter_number + 1))
                    yield from self._modify_vm("--cableconnected{} off".format(adapter_number + 1))
                    yield from self._modify_vm("--nic{} null".format(adapter_number + 1))
        yield from super().stop()

    @asyncio.coroutine
    def suspend(self):
        """
        Suspends this VirtualBox VM.
        """

        vm_state = yield from self._get_vm_state()
        if vm_state == "running":
            yield from self._control_vm("pause")
            self.status = "suspended"
            log.info("VirtualBox VM '{name}' [{id}] suspended".format(name=self.name, id=self.id))
        else:
            log.warn("VirtualBox VM '{name}' [{id}] cannot be suspended, current state: {state}".format(name=self.name,
                                                                                                        id=self.id,
                                                                                                        state=vm_state))

    @asyncio.coroutine
    def resume(self):
        """
        Resumes this VirtualBox VM.
        """

        yield from self._control_vm("resume")
        self.status = "started"
        log.info("VirtualBox VM '{name}' [{id}] resumed".format(name=self.name, id=self.id))

    @asyncio.coroutine
    def reload(self):
        """
        Reloads this VirtualBox VM.
        """

        result = yield from self._control_vm("reset")
        log.info("VirtualBox VM '{name}' [{id}] reloaded".format(name=self.name, id=self.id))
        log.debug("Reload result: {}".format(result))

    @asyncio.coroutine
    def _get_all_hdd_files(self):

        hdds = []
        properties = yield from self.manager.execute("list", ["hdds"])
        for prop in properties:
            try:
                name, value = prop.split(':', 1)
            except ValueError:
                continue
            if name.strip() == "Location":
                hdds.append(value.strip())
        return hdds

    @asyncio.coroutine
    def _reattach_linked_hdds(self):
        """
        Reattach linked cloned hard disks.
        """

        hdd_info_file = os.path.join(self.working_dir, self._vmname, "hdd_info.json")
        try:
            with open(hdd_info_file, "r", encoding="utf-8") as f:
                hdd_table = json.load(f)
        except (ValueError, OSError) as e:
            # The VM has never be started
            return

        for hdd_info in hdd_table:
            hdd_file = os.path.join(self.working_dir, self._vmname, "Snapshots", hdd_info["hdd"])
            if os.path.exists(hdd_file):
                log.info("VirtualBox VM '{name}' [{id}] attaching HDD {controller} {port} {device} {medium}".format(name=self.name,
                                                                                                                    id=self.id,
                                                                                                                    controller=hdd_info["controller"],
                                                                                                                    port=hdd_info["port"],
                                                                                                                    device=hdd_info["device"],
                                                                                                                    medium=hdd_file))

                try:
                    yield from self._storage_attach('--storagectl "{}" --port {} --device {} --type hdd --medium "{}"'.format(hdd_info["controller"],
                                                                                                                              hdd_info["port"],
                                                                                                                              hdd_info["device"],
                                                                                                                              hdd_file))

                except VirtualBoxError as e:
                    log.warn("VirtualBox VM '{name}' [{id}] error reattaching HDD {controller} {port} {device} {medium}: {error}".format(name=self.name,
                                                                                                                                         id=self.id,
                                                                                                                                         controller=hdd_info["controller"],
                                                                                                                                         port=hdd_info["port"],
                                                                                                                                         device=hdd_info["device"],
                                                                                                                                         medium=hdd_file,
                                                                                                                                         error=e))
                    continue

    @asyncio.coroutine
    def save_linked_hdds_info(self):
        """
        Save linked cloned hard disks information.

        :returns: disk table information
        """

        hdd_table = []
        if self.linked_clone:
            if os.path.exists(self.working_dir):
                hdd_files = yield from self._get_all_hdd_files()
                vm_info = yield from self._get_vm_info()
                for entry, value in vm_info.items():
                    match = re.search("^([\s\w]+)\-(\d)\-(\d)$", entry)  # match Controller-PortNumber-DeviceNumber entry
                    if match:
                        controller = match.group(1)
                        port = match.group(2)
                        device = match.group(3)
                        if value in hdd_files and os.path.exists(os.path.join(self.working_dir, self._vmname, "Snapshots", os.path.basename(value))):
                            log.info("VirtualBox VM '{name}' [{id}] detaching HDD {controller} {port} {device}".format(name=self.name,
                                                                                                                       id=self.id,
                                                                                                                       controller=controller,
                                                                                                                       port=port,
                                                                                                                       device=device))
                            hdd_table.append(
                                {
                                    "hdd": os.path.basename(value),
                                    "controller": controller,
                                    "port": port,
                                    "device": device,
                                }
                            )

            if hdd_table:
                try:
                    hdd_info_file = os.path.join(self.working_dir, self._vmname, "hdd_info.json")
                    with open(hdd_info_file, "w", encoding="utf-8") as f:
                        json.dump(hdd_table, f, indent=4)
                except OSError as e:
                    log.warning("VirtualBox VM '{name}' [{id}] could not write HHD info file: {error}".format(name=self.name,
                                                                                                              id=self.id,
                                                                                                              error=e.strerror))

        return hdd_table

    @asyncio.coroutine
    def close(self):
        """
        Closes this VirtualBox VM.
        """

        if self._closed:
            # VM is already closed
            return

        if not (yield from super().close()):
            return False

        log.debug("VirtualBox VM '{name}' [{id}] is closing".format(name=self.name, id=self.id))
        if self._console:
            self._manager.port_manager.release_tcp_port(self._console, self._project)
            self._console = None

        for adapter in self._ethernet_adapters.values():
            if adapter is not None:
                for nio in adapter.ports.values():
                    if nio and isinstance(nio, NIOUDP):
                        self.manager.port_manager.release_udp_port(nio.lport, self._project)

        for udp_tunnel in self._local_udp_tunnels.values():
            self.manager.port_manager.release_udp_port(udp_tunnel[0].lport, self._project)
            self.manager.port_manager.release_udp_port(udp_tunnel[1].lport, self._project)
        self._local_udp_tunnels = {}

        self.acpi_shutdown = False
        yield from self.stop()

        if self.linked_clone:
            hdd_table = yield from self.save_linked_hdds_info()
            for hdd in hdd_table.copy():
                log.info("VirtualBox VM '{name}' [{id}] detaching HDD {controller} {port} {device}".format(name=self.name,
                                                                                                           id=self.id,
                                                                                                           controller=hdd["controller"],
                                                                                                           port=hdd["port"],
                                                                                                           device=hdd["device"]))
                try:
                    yield from self._storage_attach('--storagectl "{}" --port {} --device {} --type hdd --medium none'.format(hdd["controller"],
                                                                                                                              hdd["port"],
                                                                                                                              hdd["device"]))
                except VirtualBoxError as e:
                    log.warn("VirtualBox VM '{name}' [{id}] error detaching HDD {controller} {port} {device}: {error}".format(name=self.name,
                                                                                                                              id=self.id,
                                                                                                                              controller=hdd["controller"],
                                                                                                                              port=hdd["port"],
                                                                                                                              device=hdd["device"],
                                                                                                                              error=e))
                    continue

            log.info("VirtualBox VM '{name}' [{id}] unregistering".format(name=self.name, id=self.id))
            yield from self.manager.execute("unregistervm", [self._name])

        log.info("VirtualBox VM '{name}' [{id}] closed".format(name=self.name, id=self.id))
        self._closed = True

    @property
    def headless(self):
        """
        Returns either the VM will start in headless mode

        :returns: boolean
        """

        return self._headless

    @headless.setter
    def headless(self, headless):
        """
        Sets either the VM will start in headless mode

        :param headless: boolean
        """

        if headless:
            log.info("VirtualBox VM '{name}' [{id}] has enabled the headless mode".format(name=self.name, id=self.id))
        else:
            log.info("VirtualBox VM '{name}' [{id}] has disabled the headless mode".format(name=self.name, id=self.id))
        self._headless = headless

    @property
    def acpi_shutdown(self):
        """
        Returns either the VM will use ACPI shutdown

        :returns: boolean
        """

        return self._acpi_shutdown

    @acpi_shutdown.setter
    def acpi_shutdown(self, acpi_shutdown):
        """
        Sets either the VM will use ACPI shutdown

        :param acpi_shutdown: boolean
        """

        if acpi_shutdown:
            log.info("VirtualBox VM '{name}' [{id}] has enabled the ACPI shutdown mode".format(name=self.name, id=self.id))
        else:
            log.info("VirtualBox VM '{name}' [{id}] has disabled the ACPI shutdown mode".format(name=self.name, id=self.id))
        self._acpi_shutdown = acpi_shutdown

    @property
    def ram(self):
        """
        Returns the amount of RAM allocated to this VirtualBox VM.

        :returns: amount RAM in MB (integer)
        """

        return self._ram

    @asyncio.coroutine
    def set_ram(self, ram):
        """
        Set the amount of RAM allocated to this VirtualBox VM.

        :param ram: amount RAM in MB (integer)
        """

        if ram == 0:
            return

        yield from self._modify_vm('--memory {}'.format(ram))

        log.info("VirtualBox VM '{name}' [{id}] has set amount of RAM to {ram}".format(name=self.name, id=self.id, ram=ram))
        self._ram = ram

    @property
    def vmname(self):
        """
        Returns the VirtualBox VM name.

        :returns: VirtualBox VM name
        """

        return self._vmname

    @asyncio.coroutine
    def set_vmname(self, vmname):
        """
        Renames the VirtualBox VM.

        :param vmname: VirtualBox VM name
        """

        if self.linked_clone:
            if self.status == "started":
                raise VirtualBoxError("You can't change the name of running VM {}".format(self._name))
            yield from self._modify_vm('--name "{}"'.format(vmname))

        log.info("VirtualBox VM '{name}' [{id}] has set the VM name to '{vmname}'".format(name=self.name, id=self.id, vmname=vmname))
        self._vmname = vmname

    @property
    def adapters(self):
        """
        Returns the number of adapters configured for this VirtualBox VM.

        :returns: number of adapters
        """

        return self._adapters

    @asyncio.coroutine
    def set_adapters(self, adapters):
        """
        Sets the number of Ethernet adapters for this VirtualBox VM instance.

        :param adapters: number of adapters
        """

        # check for the maximum adapters supported by the VM
        self._maximum_adapters = yield from self._get_maximum_supported_adapters()
        if adapters > self._maximum_adapters:
            raise VirtualBoxError("Number of adapters above the maximum supported of {}".format(self._maximum_adapters))

        self._ethernet_adapters.clear()
        for adapter_number in range(0, adapters):
            self._ethernet_adapters[adapter_number] = EthernetAdapter()

        self._adapters = len(self._ethernet_adapters)
        log.info("VirtualBox VM '{name}' [{id}] has changed the number of Ethernet adapters to {adapters}".format(name=self.name,
                                                                                                                  id=self.id,
                                                                                                                  adapters=adapters))

    @property
    def use_any_adapter(self):
        """
        Returns either GNS3 can use any VirtualBox adapter on this instance.

        :returns: boolean
        """

        return self._use_any_adapter

    @use_any_adapter.setter
    def use_any_adapter(self, use_any_adapter):
        """
        Allows GNS3 to use any VirtualBox adapter on this instance.

        :param use_any_adapter: boolean
        """

        if use_any_adapter:
            log.info("VirtualBox VM '{name}' [{id}] is allowed to use any adapter".format(name=self.name, id=self.id))
        else:
            log.info("VirtualBox VM '{name}' [{id}] is not allowed to use any adapter".format(name=self.name, id=self.id))
        self._use_any_adapter = use_any_adapter

    @property
    def adapter_type(self):
        """
        Returns the adapter type for this VirtualBox VM instance.

        :returns: adapter type (string)
        """

        return self._adapter_type

    @adapter_type.setter
    def adapter_type(self, adapter_type):
        """
        Sets the adapter type for this VirtualBox VM instance.

        :param adapter_type: adapter type (string)
        """

        self._adapter_type = adapter_type
        log.info("VirtualBox VM '{name}' [{id}]: adapter type changed to {adapter_type}".format(name=self.name,
                                                                                                id=self.id,
                                                                                                adapter_type=adapter_type))

    @asyncio.coroutine
    def _get_vm_info(self):
        """
        Returns this VM info.

        :returns: dict of info
        """

        vm_info = {}
        results = yield from self.manager.execute("showvminfo", [self._vmname, "--machinereadable"])
        for info in results:
            try:
                name, value = info.split('=', 1)
            except ValueError:
                continue
            vm_info[name.strip('"')] = value.strip('"')
        return vm_info

    @asyncio.coroutine
    def _get_maximum_supported_adapters(self):
        """
        Returns the maximum adapters supported by this VM.

        :returns: maximum number of supported adapters (int)
        """

        # check the maximum number of adapters supported by the VM
        vm_info = yield from self._get_vm_info()
        maximum_adapters = 8
        if "chipset" in vm_info:
            chipset = vm_info["chipset"]
            if chipset == "ich9":
                maximum_adapters = int(self._system_properties["Maximum ICH9 Network Adapter count"])
        return maximum_adapters

    def _get_pipe_name(self):
        """
        Returns the pipe name to create a serial connection.

        :returns: pipe path (string)
        """

        if sys.platform.startswith("win"):
            pipe_name = r"\\.\pipe\gns3_vbox\{}".format(self.id)
        else:
            pipe_name = os.path.join(tempfile.gettempdir(), "gns3_vbox", "{}".format(self.id))
            try:
                os.makedirs(os.path.dirname(pipe_name), exist_ok=True)
            except OSError as e:
                raise VirtualBoxError("Could not create the VirtualBox pipe directory: {}".format(e))
        return pipe_name

    @asyncio.coroutine
    def _set_serial_console(self):
        """
        Configures the first serial port to allow a serial console connection.
        """

        # activate the first serial port
        yield from self._modify_vm("--uart1 0x3F8 4")

        # set server mode with a pipe on the first serial port
        pipe_name = self._get_pipe_name()
        args = [self._vmname, "--uartmode1", "server", pipe_name]
        yield from self.manager.execute("modifyvm", args)

    @asyncio.coroutine
    def _storage_attach(self, params):
        """
        Change storage medium in this VM.

        :param params: params to use with sub-command storageattach
        """

        args = shlex.split(params)
        yield from self.manager.execute("storageattach", [self._vmname] + args)

    @asyncio.coroutine
    def _get_nic_attachements(self, maximum_adapters):
        """
        Returns NIC attachements.

        :param maximum_adapters: maximum number of supported adapters
        :returns: list of adapters with their Attachment setting (NAT, bridged etc.)
        """

        nics = []
        vm_info = yield from self._get_vm_info()
        for adapter_number in range(0, maximum_adapters):
            entry = "nic{}".format(adapter_number + 1)
            if entry in vm_info:
                value = vm_info[entry]
                nics.append(value.lower())
            else:
                nics.append(None)
        return nics

    @asyncio.coroutine
    def _set_network_options(self):
        """
        Configures network options.
        """

        nic_attachments = yield from self._get_nic_attachements(self._maximum_adapters)
        for adapter_number in range(0, self._adapters):
            attachment = nic_attachments[adapter_number]
            if attachment == "null":
                # disconnect the cable if no backend is attached.
                yield from self._modify_vm("--cableconnected{} off".format(adapter_number + 1))
            if attachment == "none":
                # set the backend to null to avoid a difference in the number of interfaces in the Guest.
                yield from self._modify_vm("--nic{} null".format(adapter_number + 1))
                yield from self._modify_vm("--cableconnected{} off".format(adapter_number + 1))

            if self.use_ubridge:
                # use a local UDP tunnel to connect to uBridge instead
                if adapter_number not in self._local_udp_tunnels:
                    self._local_udp_tunnels[adapter_number] = self._create_local_udp_tunnel()
                nio = self._local_udp_tunnels[adapter_number][0]
            else:
                nio = self._ethernet_adapters[adapter_number].get_nio(0)

            if nio:
                if not self._use_any_adapter and attachment not in ("none", "null", "generic"):
                    raise VirtualBoxError("Attachment ({}) already configured on adapter {}. "
                                          "Please set it to 'Not attached' to allow GNS3 to use it.".format(attachment,
                                                                                                            adapter_number + 1))

                yield from self._modify_vm("--nictrace{} off".format(adapter_number + 1))
                vbox_adapter_type = "82540EM"
                if self._adapter_type == "PCnet-PCI II (Am79C970A)":
                    vbox_adapter_type = "Am79C970A"
                if self._adapter_type == "PCNet-FAST III (Am79C973)":
                    vbox_adapter_type = "Am79C973"
                if self._adapter_type == "Intel PRO/1000 MT Desktop (82540EM)":
                    vbox_adapter_type = "82540EM"
                if self._adapter_type == "Intel PRO/1000 T Server (82543GC)":
                    vbox_adapter_type = "82543GC"
                if self._adapter_type == "Intel PRO/1000 MT Server (82545EM)":
                    vbox_adapter_type = "82545EM"
                if self._adapter_type == "Paravirtualized Network (virtio-net)":
                    vbox_adapter_type = "virtio"
                args = [self._vmname, "--nictype{}".format(adapter_number + 1), vbox_adapter_type]
                yield from self.manager.execute("modifyvm", args)

                if isinstance(nio, NIOUDP):
                    log.debug("setting UDP params on adapter {}".format(adapter_number))
                    yield from self._modify_vm("--nic{} generic".format(adapter_number + 1))
                    yield from self._modify_vm("--nicgenericdrv{} UDPTunnel".format(adapter_number + 1))
                    yield from self._modify_vm("--nicproperty{} sport={}".format(adapter_number + 1, nio.lport))
                    yield from self._modify_vm("--nicproperty{} dest={}".format(adapter_number + 1, nio.rhost))
                    yield from self._modify_vm("--nicproperty{} dport={}".format(adapter_number + 1, nio.rport))
                    yield from self._modify_vm("--cableconnected{} on".format(adapter_number + 1))

                if nio.capturing:
                    yield from self._modify_vm("--nictrace{} on".format(adapter_number + 1))
                    yield from self._modify_vm('--nictracefile{} "{}"'.format(adapter_number + 1, nio.pcap_output_file))

                if self.use_ubridge and not self._ethernet_adapters[adapter_number].get_nio(0):
                    yield from self._modify_vm("--cableconnected{} off".format(adapter_number + 1))

        for adapter_number in range(self._adapters, self._maximum_adapters):
            log.debug("disabling remaining adapter {}".format(adapter_number))
            yield from self._modify_vm("--nic{} none".format(adapter_number + 1))

    @asyncio.coroutine
    def _create_linked_clone(self):
        """
        Creates a new linked clone.
        """

        gns3_snapshot_exists = False
        vm_info = yield from self._get_vm_info()
        for entry, value in vm_info.items():
            if entry.startswith("SnapshotName") and value == "GNS3 Linked Base for clones":
                gns3_snapshot_exists = True

        if not gns3_snapshot_exists:
            result = yield from self.manager.execute("snapshot", [self._vmname, "take", "GNS3 Linked Base for clones"])
            log.debug("GNS3 snapshot created: {}".format(result))

        args = [self._vmname,
                "--snapshot",
                "GNS3 Linked Base for clones",
                "--options",
                "link",
                "--name",
                self.name,
                "--basefolder",
                self.working_dir,
                "--register"]

        result = yield from self.manager.execute("clonevm", args)
        log.debug("VirtualBox VM: {} cloned".format(result))

        self._vmname = self._name
        yield from self.manager.execute("setextradata", [self._vmname, "GNS3/Clone", "yes"])

        # We create a reset snapshot in order to simplify life of user who want to rollback their VM
        # Warning: Do not document this it's seem buggy we keep it because Raizo students use it.
        try:
            args = [self._vmname, "take", "reset"]
            result = yield from self.manager.execute("snapshot", args)
            log.debug("Snapshot 'reset' created: {}".format(result))
        # It seem sometimes this failed due to internal race condition of Vbox
        # we have no real explanation of this.
        except VirtualBoxError:
            log.warn("Snapshot 'reset' not created")

        os.makedirs(os.path.join(self.working_dir, self._vmname), exist_ok=True)

    @asyncio.coroutine
    def _start_console(self):
        """
        Starts remote console support for this VM.
        """
        self._remote_pipe = yield from asyncio_open_serial(self._get_pipe_name())
        server = AsyncioTelnetServer(reader=self._remote_pipe,
                                     writer=self._remote_pipe,
                                     binary=True,
                                     echo=True)
        self._telnet_server = yield from asyncio.start_server(server.run, self._manager.port_manager.console_host, self.console)

    @asyncio.coroutine
    def _stop_remote_console(self):
        """
        Stops remote console support for this VM.
        """
        if self._telnet_server:
            self._telnet_server.close()
            yield from self._telnet_server.wait_closed()
            self._remote_pipe.close()
            self._telnet_server = None

    @asyncio.coroutine
    def adapter_add_nio_binding(self, adapter_number, nio):
        """
        Adds an adapter NIO binding.

        :param adapter_number: adapter number
        :param nio: NIO instance to add to the slot/port
        """

        try:
            adapter = self._ethernet_adapters[adapter_number]
        except KeyError:
            raise VirtualBoxError("Adapter {adapter_number} doesn't exist on VirtualBox VM '{name}'".format(name=self.name,
                                                                                                            adapter_number=adapter_number))

        if self.ubridge:
            yield from self._add_ubridge_udp_connection("VBOX-{}-{}".format(self._id, adapter_number),
                                                        self._local_udp_tunnels[adapter_number][1],
                                                        nio)
            yield from self._control_vm("setlinkstate{} on".format(adapter_number + 1))
        else:
            vm_state = yield from self._get_vm_state()
            if vm_state == "running":
                if isinstance(nio, NIOUDP):
                    # dynamically configure an UDP tunnel on the VirtualBox adapter
                    yield from self._control_vm("nic{} generic UDPTunnel".format(adapter_number + 1))
                    yield from self._control_vm("nicproperty{} sport={}".format(adapter_number + 1, nio.lport))
                    yield from self._control_vm("nicproperty{} dest={}".format(adapter_number + 1, nio.rhost))
                    yield from self._control_vm("nicproperty{} dport={}".format(adapter_number + 1, nio.rport))
                    yield from self._control_vm("setlinkstate{} on".format(adapter_number + 1))

                    # check if the UDP tunnel has been correctly set
                    vm_info = yield from self._get_vm_info()
                    generic_driver_number = "generic{}".format(adapter_number + 1)
                    if generic_driver_number not in vm_info and vm_info[generic_driver_number] != "UDPTunnel":
                        log.warning("UDP tunnel has not been set on nic: {}".format(adapter_number + 1))
                        self.project.emit("log.warning", {"message": "UDP tunnel has not been set on nic: {}".format(adapter_number + 1)})

        adapter.add_nio(0, nio)
        log.info("VirtualBox VM '{name}' [{id}]: {nio} added to adapter {adapter_number}".format(name=self.name,
                                                                                                 id=self.id,
                                                                                                 nio=nio,
                                                                                                 adapter_number=adapter_number))

    @asyncio.coroutine
    def adapter_remove_nio_binding(self, adapter_number):
        """
        Removes an adapter NIO binding.

        :param adapter_number: adapter number

        :returns: NIO instance
        """

        try:
            adapter = self._ethernet_adapters[adapter_number]
        except KeyError:
            raise VirtualBoxError("Adapter {adapter_number} doesn't exist on VirtualBox VM '{name}'".format(name=self.name,
                                                                                                            adapter_number=adapter_number))

        if self.ubridge:
            yield from self._ubridge_send("bridge delete {name}".format(name="VBOX-{}-{}".format(self._id, adapter_number)))
            yield from self._control_vm("setlinkstate{} off".format(adapter_number + 1))
        else:
            vm_state = yield from self._get_vm_state()
            if vm_state == "running":
                # dynamically disable the VirtualBox adapter
                yield from self._control_vm("setlinkstate{} off".format(adapter_number + 1))
                yield from self._control_vm("nic{} null".format(adapter_number + 1))

        nio = adapter.get_nio(0)
        if isinstance(nio, NIOUDP):
            self.manager.port_manager.release_udp_port(nio.lport, self._project)
        adapter.remove_nio(0)

        log.info("VirtualBox VM '{name}' [{id}]: {nio} removed from adapter {adapter_number}".format(name=self.name,
                                                                                                     id=self.id,
                                                                                                     nio=nio,
                                                                                                     adapter_number=adapter_number))
        return nio

    @asyncio.coroutine
    def start_capture(self, adapter_number, output_file):
        """
        Starts a packet capture.

        :param adapter_number: adapter number
        :param output_file: PCAP destination file for the capture
        """

        try:
            adapter = self._ethernet_adapters[adapter_number]
        except KeyError:
            raise VirtualBoxError("Adapter {adapter_number} doesn't exist on VirtualBox VM '{name}'".format(name=self.name,
                                                                                                            adapter_number=adapter_number))

        if not self.use_ubridge:
            vm_state = yield from self._get_vm_state()
            if vm_state == "running" or vm_state == "paused" or vm_state == "stuck":
                raise VirtualBoxError("Sorry, packet capturing on a started VirtualBox VM is not supported without using uBridge")

        nio = adapter.get_nio(0)

        if not nio:
            raise VirtualBoxError("Adapter {} is not connected".format(adapter_number))

        if nio.capturing:
            raise VirtualBoxError("Packet capture is already activated on adapter {adapter_number}".format(adapter_number=adapter_number))

        nio.startPacketCapture(output_file)

        if self.ubridge:
            yield from self._ubridge_send('bridge start_capture {name} "{output_file}"'.format(name="VBOX-{}-{}".format(self._id, adapter_number),
                                                                                               output_file=output_file))

        log.info("VirtualBox VM '{name}' [{id}]: starting packet capture on adapter {adapter_number}".format(name=self.name,
                                                                                                             id=self.id,
                                                                                                             adapter_number=adapter_number))

    def stop_capture(self, adapter_number):
        """
        Stops a packet capture.

        :param adapter_number: adapter number
        """

        try:
            adapter = self._ethernet_adapters[adapter_number]
        except KeyError:
            raise VirtualBoxError("Adapter {adapter_number} doesn't exist on VirtualBox VM '{name}'".format(name=self.name,
                                                                                                            adapter_number=adapter_number))

        nio = adapter.get_nio(0)

        if not nio:
            raise VirtualBoxError("Adapter {} is not connected".format(adapter_number))

        nio.stopPacketCapture()

        if self.ubridge:
            yield from self._ubridge_send('bridge stop_capture {name}'.format(name="VBOX-{}-{}".format(self._id, adapter_number)))

        log.info("VirtualBox VM '{name}' [{id}]: stopping packet capture on adapter {adapter_number}".format(name=self.name,
                                                                                                             id=self.id,
                                                                                                             adapter_number=adapter_number))